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Old 08-12-2010, 09:27 PM
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If you have time run hp/torque numbers

If someone could run the software floating around out there and help out a fellow neighbor, that would be very much appreciated. I have a Chevy 350 bottom end recently built and want to put some money for a little more power. So a basic 350 cast 12 cc dish pistons.

I will be using the following parts with my build.
Racing Head Service Vortec Torker heads- Cast Iron 170cc intake runners, 67cc exhaust, and 64 cc chambers. ( with these chambers My compression with a .40 quench gasket will be 9.51:1) as far as springs they will be matched correctly with the cam.

Flow chart as follows from .100 to .500"
Intake (2.02): 77, 155, 220, 263, 270.--Exhaust(1.6): 74, 140, 168, 172, 174.

CompCams Magnum 270H Flat cam-
Intake Duration at 050 inch Lift 224
Exhaust Duration at 050 inch Lift 224
Duration at 050 inch Lift 224 int./224 exh.
Advertised Intake Duration 270
Advertised Exhaust Duration 270
Advertised Duration 270 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.470 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.470 in.
Valve Lift with Factory Rocker Arm Ratio 0.470/.470 exh.
Lobe Separation (degrees) 110

Edelbrock Performer Rpm Vortec intake manifold
Harland Sharp full roller 1.5 rockers.
3,000 stall
650 Holley or BG Demon vacuum secondaries carb.
Hedman full length tube headers I believe 1-5/8"

The car is a 72 c/10 pickup with 3.73 posi rear end and a th-350 transmission weighing about 4,200 lbs. Like I said if you can help out its greatly appreciated also let me know if I'm missing any important info. thanks

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Last edited by kpcrossfire6; 08-12-2010 at 09:38 PM.
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Old 08-13-2010, 02:34 AM
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If you want an accurate estimate, techinspector1 has said the following is needed:

DYNOSIM REQUIRED DATA....
Bore
Stroke
Rod Length
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg gives for range
Intake valve diameter
Exhaust valve diameter
Static compression ratio
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI)
Intake manifold type, mfg (single 4-bbl, two 4-bbl, one 2-bbl, three 2-bbl, individual runner Weber, mechanical fuel injection, low-rise, high-rise, tunnel ram, dual-plane, single-plane, part no. if you have it.
Exhaust system (be specific, primary tube size if long-tube headers)
I have quite a library of CompCams (give me part number, not grind number) in my files, but if you are using another mfg, I'll need type (flat, roller, solid, hyd.), intake valve lift, exhaust valve lift and the following timing info and at what tappet lift the info is valid...(0.006", 0.050") I can calculate from 0.020" if I'm given enough information, but again, that takes my time.
Intake opens ______BTDC
Intake closes ______ABDC
Exhaust opens______BBDC
Exhaust closes______ATDC
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Old 08-13-2010, 02:22 PM
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Bore 4"
Stroke 3.48
Rod Length 5.7
Cylinder head flow mfg only states .100 through .500
Intake valve diameter 2.02
Exhaust valve diameter 1.6
Static compression ratio 9.51:1
CFM, type of induction single 4-bbl carburetor
Intake manifold type dual plane manifold
Exhaust system long tube 1-5/8"

Compcams part number for camshaft (12-211-2)
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Old 08-13-2010, 04:13 PM
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List the cam specs, don't make us go looking for them.

Need those head flow #'s from .100"-.500" or you won't get good results.

Need the intake specifics, brand and name.

Carb brand and size.

Header collector size and length.

The more specific you can be about everything the better the results will be... You know, like computers....Garbage in, Garbage out
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Old 08-14-2010, 07:56 AM
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First post has flow numbers up to 0.500", but no cam specs...

TI has said it takes a good chunk of his time to run these numbers, so anything that you do to make it easier, the better your chances of getting results.

He's run hundreds (thousands?) of sims, so if it's just another plain vanilla SBC deal (in other words- another "same-old same-old" sim), you need to provide everything you can- and like ericnova72 said- that inclused printing out the cam specs and not just a link.

If I were to make a WAG, I'd say around 400 HP and similar TQ.
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Old 08-15-2010, 12:58 PM
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Cam Specs
RPM Range: 1800 to 5800
Valve Timing: .006
Lobe-Center Angle: 110
Intake Centerline: 106
Valve Lash: hydraulic
Duration: Intake: 270 Exhaust: 270
Duration @ .050" Lift: Intake: 224 Exhaust: 224
Valve lift: Intake: 0.47 Exhaust: 0.47
Lobe Lift: Intake: .313 Exhaust: .313
Valve Timing @ 0.006 Lift:
Intake opens __29____BTDC
Intake closes __61____ABDC
Exhaust opens___69___BBDC
Exhaust closes___21___ATDC

RHS Pro Torker Vortec Head Flow chart
Intake: (2.02) Runner size 170cc
.100-77
.200-155
.300-220
.400-263
.500-270
Exhaust (1.6) Runner size 67cc
.100-74
.200-140
.300-168
.400-172
.500-174
Edelbrock Performer Rpm Dual Plane vortec manifold
Not sure on Carb Brand yet but a single 4 barrel around 650 cfm
Hope this helps!
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Old 08-15-2010, 05:02 PM
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350/375 From The Air Head Dyno

I thing you're sucking on a dry titty, dyno sim guys are on vacation or just not giving it up. I say 350/375, you probably doing one HP per CI and a bit more torque. Check me out TECH INSPECTOR, please tell me I'm close. olnolan
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Old 08-15-2010, 05:58 PM
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Quick online calculation shows 411 hp @ 5600 rpm, with a 5800 rpm shift point. I used www.speedwaybids.com online dyno, figured 1600ft elevation and 90% volumetric efficiency.

It's just a quick program, maybe the Techinspector will come along, he has DynoSim IIRC. I lost my good program to a hard drive failure.
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